Armature.



S. A. DUVALL. ARMATURE.

APPLICATION FILED MAB.14, 1910,

994303,' Patented June 6,1911.

'the core member 5 said core member and noie.

illi'iliED STATES .PATENT 0 sion.

STANLEY A. DUVALL, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR T0 JOHN S. NASH, OF CHICAGO, ILLINOIS.|

ARMATURE.

Application filed March To .all 'io/"tom it may concer.

Be it known that, To, STANLEY AQ. Dumm., a citizen of the United States, residing at San Francisco, inv the county of San Fran cisco and State of California, have invented a new and useful Armature, of which the oilowing is a specification.

This invention-relates to an armature for dynainoelectric or magnetdelectric machines, and particularly to the armature of magnetos such as are used in electric ignition circuits.

rihe main object of the .present'inventicn is to provide an armature which. will be Water-proof or etlectually protected against moisture and other atmospheric` conditions generally.

A further object of the invention is to provide an' armature of the H-type in which increase of the pole extension may be'provided for Without diminishing the space provided. for windings.

Another object of the invention is to facilita-te the Winding of the armature..

ther objects of the invention will appear hereinafteru The accompanying' drawings illustrate the invention, and .referring thereto :--Figure l is a longitudinal section of the armature. Fig. 2 is a. transverse section thereof on line t2-r2 Fig. l. F ig. 3 is an end elevation. Fig. i is a perspective view oi the armature, and Fig. 5 a perspective of the Winding or coil thereof. Fig. 6 is a partial sectionon line 6- Fig. 2.

g l designates the' shaft of the armature which may be provided with the usual commutator or current collecting means, not

shown. Said shaft is madel in two sections, the shaft sections l being connected respectively to the end plates or disks 2 ot' the armature, and said disks 2 being connected by the longitudinally extending segmental pole pieces 3, screws 4 connecting said disks and pole pieces to form a rigid structure. Pole pieces 3 are magnetically connected by secured to the pole pieces by screws 6, 'L pieces being of magnetic material. The ends of the core 5 are formed con'vexly to tthe inside i'aces of the pole pieces 3, and said pole, pieces extend beyond the core member a snlicicnt distance to give the desired polar extension. The Winding, indicated at i", surrounds the core member and occupies Specification of Letters Patent.

the space between said core'nienibcr armature.

Patented June d, ilt,

14, 1910. Serial No. 549,346.

and the segmental pole pieces, and itwill be seen that the lateral extension of the segmental poli" pieces may be increased as much as desired without affecting the space provided for the Winding. Said Winding is tapered at each end, as shown at 7, to extend into the space between the core and the pole pieces.

The segmental pole pieces 3 inclose a considerable portion of the periphery of the In order to complete the inclesure or incasement of the armature and thereby render the same Water-proof, seg-- mental plates 9 are provided extending across the space or opening between the ends of the pole pieces and fitting into grooves or recesses l0 in said pole pieces and into segmental slots or grooves 1l in the end disks 2, so that When the parts are fastened together by the screws 4 and 6 these closure plates 9 will be tightly clamped in position Within the grooves l0' and l1 and hermetically seal the armature. l/Vhen the segmene titi tal closure plates 9 are inserted in the manner stated, a substantially cylindrical armature is formed presenting minimum air re sistance in its rotation, the segmental plates Y9 being of substantially the saine curvature as the segmental pole pieces 3 and approxi mately flush With the surfacesthereof.

The armature so constructed vis particularly adapted for use in automobiles Where it is liable to be immersed in Water, the incasement of the armature, as above described, rendering the same Water-prooic so that the machine can run through a consid erable depth of Water without stopping or injurr to the magneto. The closure niembers 9 may be of any suitable material, for

example, brass or other non-magnetic metal or material. The end plates or disks 2 may' also be of any noinniagnetic metal. or suity able material.'

The above described construction of armature has the advantage that the coil 7 may be Wound separately on any suitable forno and can then be slipped over the core and .the pole 'pieces Ithen secured to the core, retaining the fr 'i in place, ad extending partly aronmA rve coil.

Vhat i claim A n armature lfor dynamo-electric inachines comprising a core-member, segmen- -tal pole pieces at each end ot thp core inemn ber, disks o non-magnetic material. secured io eah end o the pole pieces, a co surin the said slot'sin e pole piece@ and. emi rounding the core member and occupying the disks. l

space 1netween the Core member and the poe pieces and disks, and segmental closure my hand at members of non-magnetic material closing 21st day of February 1910.

the space between the ends of the pole pieces and. the end disks, said segment-a1 pole pieces having ongludinal `Slots in their edges and said en dlsks having segmental-slots and l0 said closure. members engaging and fitting In Atestimon whereof, I have'lereune os Angees, Cahimtma, time STANLEY A., DUVLL.

In prenceof# ARTHUR P. KNIGHT, 'FRANK L. A. Gmmm- 

